The ASME PVHO Process

For a full overview of the HYDROSPACE Fabrication and Quality Assurance process, click below:

HYDROSPACE ASME PVHO-1 FABRICATION and QA PROCESS

Hydrospace provides all other documents and keeps both hard copy and electronic copies of all certifications on file for future reference or if originals are lost.

Function of PVHO Forms

The design and certification of PVHO acrylic windows is traced through a series of five (5) certificates of conformance, namely PVHO-1 FORMS VP1 through VP6. The complete fabrication process includes the following step, listed in order of fabrication:

Copies of all these PVHO documents MUST be maintained by the fabricator, user and operator for the life of the window.

1. PVHO-1 FORM VP2 – Window Design Certification
Each New window design must conform to all PVHO-1 engineering requirements.
PVHO-1 Form VP2 Certifies that the ENGINEERING DESIGN Meets PVHO
(Class Agency Approval of Engr Drawing & Form VP2 Required for Classification)

2. PVHO-1 FORM VP3 – Acrylic Material Certification
All material must meet minimum performance criteria specified in ASME PVHO-1
PVHO-1 Form VP3 Certifies that the ACRYLIC MATERIAL Meets PVHO
(Class Agency Surveyor Witness Required for Classification)

3. PVHO-1 FORM VP4 – Material Testing Certification
All material must be individually tested for conformance to Minimum PVHO-1 Specifications
PVHO-1 Form VP4 Certifies the actual MATERIAL PERFORMANCE
(Class Agency Surveyor Witness Required for Classification)

4. PVHO-1 FORM VP1 – Fabrication Certification
Each window must be inspected after fabrication and document conformance to the Engineering Drawing, PVHO FORM VP2 and all PVHO-1 fabrication requirements
PVHO-1 Form VP1 is the CERTIFICATE of CONFORMANCE for each window.
(Class Agency Surveyor Witness Required for Classification)

5. PVHO-1 FORM VP5 – Hydrostatic Pressure Test Certification
Each window must be Hydrostatically tested in conformance to the window & assembly Drawing, PVHO FORM VP2 and PVHO-1 pressure testing requirements
PVHO-1 Form VP5 certifies the HYDROSTATIC PRESSURE TEST for each window.
(Class Agency Surveyor Witness Required for Classification)

6. PVHO-1 FORM VP6 – Repair Certification
Any repair to a PVHO window must be fully documented.
PVHO-1 Form VP6 certifies the REPAIR meets all PVHO-1 requirements.
(Class Agency Surveyor Witness Required for Classification)

Copies of all these PVHO documents MUST be maintained by the fabricator, user and operator for the life of the window.

Equivalent PVHO Documents

The names of the PVHO forms were changed in 2007. The same forms are used but the naming is different. There are still a lot of PVHO documents on hand that comply with the older convention. The following is a useful cross-reference table between the old and new nomenclature.

Present ASME PVHO-1 Forms OLD ASME PVHO Enclosures
FORM VP1 Fabrication Cert PVHO ENCLOSURE 5
FORM VP2 Design Cert PVHO ENCLOSURE 1
FORM VP3 Material Cert PVHO ENCLOSURE 2
FORM VP4 Material Testing PVHO ENCLOSURE 3
FORM VP5 Hydrostatic Test PVHO ENCLOSURE 4